# Cubelings

> Your own hosted Minecraft world with an AI builder called Cog already
> living in it. Say what you want in plain language and they go and build it
> while you watch — then checks their own work and tells you what they found.
> Minecraft today, Hytale next.

Cog plans with a language model and builds with deterministic, tested code, so
the thing that touches your world is the part that can be verified. Every build
is read back out of the world afterwards rather than reported from intent.

## Pages
- [Home](https://cubelings.com/): what it is, and the world building itself as you scroll
- [What you can ask for](https://cubelings.com/capabilities/): the requests they handle, in plain words
- [Watch them build it](https://cubelings.com/examples/): canyons, castles, lakes, secret doors — each one built and measured
- [How it works](https://cubelings.com/how-it-works/): you ask, they plan, tested code places the blocks
- [Verification](https://cubelings.com/verification/): how they check their own builds, and what the numbers mean
- [Creative or survival](https://cubelings.com/creative-vs-survival/): conjure it, or make them go and earn it
- [Hosting](https://cubelings.com/hosting/): the world keeps running when you log off
- [Safety](https://cubelings.com/safety/): for parents — what they refuse, and who can get in
- [Games](https://cubelings.com/games/): Minecraft Java (Paper) now, Hytale next
- [Blog](https://cubelings.com/blog/): engineering notes on how this was measured

## What they build
- Anything you describe: they design it themselves rather than picking from a
  catalogue. A house shaped like a cartoon character, a giant statue, a rocket,
  a chess knight. Cog drafts the shape, reads back their own front, side and plan
  elevations, states what is wrong with them, and redrafts — three or four times
  over — before a single block is placed. Then they build it and check every
  block they placed, and counts how much room there is inside.
- Games, not just buildings: ask for something to PLAY and they write new rules
  and load them into the running server — no restart, nobody kicked, nothing to
  install. Teams, scoreboards, regions that react, win conditions, and the pitch
  laid to play it on. Cog does not write raw commands: they write a game, and
  deterministic code compiles every command from fields it has already checked.
- they can take a build down again: the space is cleared and then read back to
  prove it is empty, and the design stays in the library so it can go up
  somewhere else. Cog only ever removes things they built themselves, because the
  removal works from their own record of what they put where.
- they keep every design they draw, with where it was put and what the audit
  said. "Another one of those over by the lake" is therefore the SAME design put
  up again, measured at 7.9 seconds for a 29,270-block lighthouse against 367
  seconds to design it. It also means they know what is already standing where,
  so a request for a spot that is taken gets "there is already a SpongeBob house
  there" rather than a build on a roof.
- Terrain: carve a canyon with terraced walls and banded strata; run a waterfall
  down a cliff into a contained plunge pool; dig a lake with a real shoreline;
  raise hills and plateaus; level a plot to build on.
- Structures: pyramids with a lit passage and a chamber you can stand in;
  watchtowers with a spiral stair that climbs one block a step; castle keeps
  with curtain walls, corner towers and a gatehouse.
- Settlements: houses with doors that open and lit interiors; PvP arenas that
  are symmetric by construction.
- Ways through: roads that read the ground they cross, and bridges over open
  water with the deck raised clear of the surface.
- Rollercoasters: a closed loop of real rail with a hill in it, powered rails
  keeping the cart moving, timber supports and a minecart to ride.
- Redstone: hidden piston doors wired block by block — real circuits, not
  animations.
- Playing the game: mining, crafting, farming, fighting, fetching, and
  following you around.

## Measured facts
Every number below was measured against a running server and read back out of
the world independently, not taken from the build's own report.

- Survival capability: 26 of 27 task runs passed across eight skills.
- Composite errand end to end, unattended (gather, walk, deposit): 8 of 8.
- Hidden piston door: verified opening, sealing and repeating at 2, 4 and 6
  blocks wide.
- Castle keep: 1,721 interior cells reachable, 0 ways out with the gate sealed.
- PvP arena: west and east block counts equal across all eight materials.
- Lake: 667 water blocks placed, 667 present 25 seconds later, 0 outside the basin.
- Road audit: 357 columns, 1 connected piece, 0 holes, 0 unwalkable steps.
- Ferris wheel: 92 of 92 parts, every gondola at radius 12.000, and it turns.
- Rollercoaster: 132 track cells, every one carrying the exact rail shape the
  curve needs, 28 boosters all live — and a cart put on it travelled 55 blocks
  in 10 seconds and took the full six-block hill.
- A walk-in house shaped like SpongeBob SquarePants, asked for in plain words
  and designed from nothing: 96 x 62 x 33, 24,688 blocks placed, 24,688 correct,
  0 wrong, measured by reading the world rather than by asking the builder.
  Placed in 3 seconds. Cog then walked into it on foot from outside, finishing
  14 blocks past the wall: whether a build has an inside is settled by going in,
  not by measuring the air. Five of seven designs were walked into this way, the
  furthest 22 blocks in under 26 blocks of building. For the other two they could
  not find a route inside, and that is what they report.
- A pirate galleon out on the open sea, 96 blocks long: 30,263 placed, 30,263
  correct, 0 wrong, one solid piece.
- A rocket on a launch pad, 83 blocks tall: 22,035 placed, 22,035 correct, 0 wrong.
- Other things asked for in one sentence each, none of them prepared for in
  advance: a treehouse village in a giant oak with lit windows and rope bridges
  (35,252 blocks), a lighthouse on a rocky headland (29,270), a stone dragon
  curled round an outcrop (36,530), a giant chess knight (18,508).
- A new redstone datapack authored and running live in 1,937 ms, with players
  still connected and nothing restarted.
- A soccer game asked for in one sentence: 9 rules, 5 regions and 37 pitch-laying
  steps, designed and compiled on the first attempt, live on the server in about
  1.5 seconds. Six games have been written this way — soccer, a shooting range,
  king of the hill, a sprint race, a parkour course and an arrow raid — 67 rules
  between them. Every one of the 67 was triggered on purpose afterwards and
  every one fired. The rules that need somebody standing on a pad are checked by Cog
  standing on it themselves.

## Key facts
- Cog runs on the server and joins your world as a player. Cog is not a mod,
  and nobody needs to install anything — friends join with an unmodified game.
- Two modes: creative places blocks directly; survival makes them gather, craft
  and mine under the same rules you play by.
- Anything they build can be undone.
- A world can run whitelist-only, so only invited players can connect.

## About
- Cubelings is not affiliated with Mojang, Microsoft or Hypixel Studios.